<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title></title>
    <!--引入Vue-->
    <script type="text/javascript" src="../js/vue.js"></script>
</head>
<body>
    <div class="root">
      <h2>今天天气很{{info}}</h2>
      <button @click="changeWeather">切换天气</button>
    </div>
</body>

<script type="text/javascript">
  let vue = new Vue({
    el: '.root',
    data: {
      isHot: true
    },
    computed:{
      info(){
        return this.isHot ? '炎热' : '凉爽'
      }
    },
    methods:{
      changeWeather(){
        this.isHot = !this.isHot
      }
    }
  })
</script>
</html>
